* David Hildenbrand <david@xxxxxxxxxx> [2020-05-08 15:42:12]: Hi David, Thanks for the steps to tryout. > > > > #! /bin/bash > > sudo x86_64-softmmu/qemu-system-x86_64 \ > > --enable-kvm \ > > -m 4G,maxmem=20G,slots=2 \ > > -smp sockets=2,cores=2 \ > > -numa node,nodeid=0,cpus=0-1,mem=4G -numa node,nodeid=1,cpus=2-3,mem=0G \ > > Sorry, this line has to be > > -numa node,nodeid=0,cpus=0-3,mem=4G -numa node,nodeid=1,mem=0G \ > > > -kernel /home/dhildenb/git/linux/arch/x86_64/boot/bzImage \ > > -append "console=ttyS0 rd.shell rd.luks=0 rd.lvm=0 rd.md=0 rd.dm=0" \ > > -initrd /boot/initramfs-5.2.8-200.fc30.x86_64.img \ > > -machine pc,nvdimm \ > > -nographic \ > > -nodefaults \ > > -chardev stdio,id=serial \ > > -device isa-serial,chardev=serial \ > > -chardev socket,id=monitor,path=/var/tmp/monitor,server,nowait \ > > -mon chardev=monitor,mode=readline > > > > to get a cpu-less and memory-less node 1. Never tried with node 0. > > I tried qemu-system-x86_64 -enable-kvm -m 4G,maxmem=20G,slots=2 -smp sockets=2,cores=2 -cpu host -numa node,nodeid=0,cpus=0-3,mem=4G -numa node,nodeid=1,mem=0G -vga none -nographic -serial mon:stdio /home/srikar/fedora.qcow2 and the resulting guest was. [root@localhost ~]# numactl -H available: 1 nodes (0) node 0 cpus: 0 1 2 3 node 0 size: 3927 MB node 0 free: 3316 MB node distances: node 0 0: 10 [root@localhost ~]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 40 bits physical, 48 bits virtual CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 2 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 46 Model name: Intel(R) Xeon(R) CPU X7560 @ 2.27GHz Stepping: 6 CPU MHz: 2260.986 BogoMIPS: 4521.97 Virtualization: VT-x Hypervisor vendor: KVM Virtualization type: full L1d cache: 32K L1i cache: 32K L2 cache: 4096K L3 cache: 16384K NUMA node0 CPU(s): 0-3 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc arch_perfmon rep_good nopl xtopology cpuid tsc_known_freq pni vmx ssse3 cx16 sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer hypervisor lahf_lm cpuid_fault pti ssbd ibrs ibpb tpr_shadow vnmi flexpriority ept vpid tsc_adjust arat umip arch_capabilities [root@localhost ~]# cat /sys/devices/system/node/online 0 [root@localhost ~]# cat /sys/devices/system/node/possible 0-1 --------------------------------------------------------------------------------- I also tried qemu-system-x86_64 -enable-kvm -m 4G,maxmem=20G,slots=2 -smp sockets=2,cores=2 -cpu host -numa node,nodeid=1,cpus=0-3,mem=4G -numa node,nodeid=0,mem=0G -vga none -nographic -serial mon:stdio /home/srikar/fedora.qcow2 and the resulting guest was. [root@localhost ~]# numactl -H available: 1 nodes (0) node 0 cpus: 0 1 2 3 node 0 size: 3927 MB node 0 free: 3316 MB node distances: node 0 0: 10 [root@localhost ~]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 40 bits physical, 48 bits virtual CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 2 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 46 Model name: Intel(R) Xeon(R) CPU X7560 @ 2.27GHz Stepping: 6 CPU MHz: 2260.986 BogoMIPS: 4521.97 Virtualization: VT-x Hypervisor vendor: KVM Virtualization type: full L1d cache: 32K L1i cache: 32K L2 cache: 4096K L3 cache: 16384K NUMA node0 CPU(s): 0-3 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc arch_perfmon rep_good nopl xtopology cpuid tsc_known_freq pni vmx ssse3 cx16 sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer hypervisor lahf_lm cpuid_fault pti ssbd ibrs ibpb tpr_shadow vnmi flexpriority ept vpid tsc_adjust arat umip arch_capabilities [root@localhost ~]# cat /sys/devices/system/node/online 0 [root@localhost ~]# cat /sys/devices/system/node/possible 0-1 Even without my patch, both the combinations, I am still unable to see a cpuless, memoryless node being online. And the interesting part being even if I mark node 0 as cpuless,memoryless and node 1 as actual node, the system somewhere marks node 0 as the actual node. > > David / dhildenb > -- Thanks and Regards Srikar Dronamraju
